<template>
  <div class="star" :class="starType">
    <span
      class="star-item"
      :class="itemClass"
      v-for="(itemClass,index) of itemClasses"
      :key="index"
    ></span>
  </div>
</template>
<script>
const LENGTH = 5
const CLASS_ON = 'on'
const CLASS_HALF = 'half'
const CLASS_OFF = 'off'
export default {
  name: 'Star',
  props: {
    size: Number, // 接收尺寸
    score: Number // 接收分数
  },
  computed: {
    starType () {
      return 'star-' + this.size
    },
    itemClasses () {
      let result = []
      let score = Math.floor(this.score * 2) / 2
      let hasDecimal = score % 1 !== 0
      let integer = Math.floor(score)
      for (let i = 0; i < integer; i++) {
        result.push(CLASS_ON)
      }
      if (hasDecimal) {
        result.push(CLASS_HALF)
      }
      while (result.length < LENGTH) {
        result.push(CLASS_OFF)
      }
      return result
    }
  }
}
</script>
<style lang="stylus" scoped>
  @import '~common/styles/mixins.styl'
  .star
    font-size 0
    .star-item  //公用样式
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        bg-image-size(20px, 20px)
        margin-right 22px
        &:last-child
          margin-right 0
        &.on
          bg-image('star48_on')
        &.half
          bg-image('star48_half')
        &.off
          bg-image('star48_off')
    &.star-36
      .star-item
        bg-image-size(15px, 15px)
        margin-right 16px
        &:last-child
          margin-right 0
        &.on
          bg-image('star36_on')
        &.half
          bg-image('star36_half')
        &.off
          bg-image('star36_off')
    &.star-24
      .star-item
        bg-image-size(10px, 10px)
        margin-right 3px
        &:last-child
          margin-right 0
        &.on
          bg-image('star24_on')
        &.half
          bg-image('star24_half')
        &.off
          bg-image('star24_off')
</style>
